const path = require('path')
const webpack = require('webpack')
const createThemeColorReplacerPlugin = require('./config/plugin.config')
const UglifyJsPlugin = require('uglifyjs-webpack-plugin') //去console插件

function resolve (dir) {
  return path.join(__dirname, dir)
}

/**
 * check production or preview(pro.loacg.com only)
 * @returns {boolean}
 */
function isProd () {
  return process.env.NODE_ENV === 'production' || process.env.VUE_APP_PREVIEW === 'true'
}

const assetsCDN = {
  css: [
    '//unpkg.com/ant-design-vue@1.3.16/dist/antd.min.css'
  ],
  // https://unpkg.com/browse/vue@2.6.10/
  js: [
    '//unpkg.com/vue@2.6.10/dist/vue.min.js',
    '//unpkg.com/vue-router@3.1.3/dist/vue-router.min.js',
    '//unpkg.com/vuex@3.1.1/dist/vuex.min.js',
    '//unpkg.com/axios@0.19.0/dist/axios.min.js',
    '//unpkg.com/vue-i18n@8.14.0/dist/vue-i18n.min.js',
    '//unpkg.com/ant-design-vue@1.3.16/dist/antd.min.js'
  ]
}

// webpack build externals
const prodExternals = {
  vue: 'Vue',
  'vue-router': 'VueRouter',
  vuex: 'Vuex',
  axios: 'axios'
}

// vue.config.js
const vueConfig = {
  configureWebpack: {
    // webpack plugins
    plugins: [
      // Ignore all locale files of moment.js
      new webpack.IgnorePlugin(/^\.\/locale$/, /moment$/)
    ],
    // if prod is on, add externals
    externals: isProd() ? prodExternals : {}
  },

  chainWebpack: (config) => {
    config.resolve.alias
      .set('@$', resolve('src'))

    const svgRule = config.module.rule('svg')
    svgRule.uses.clear()
    svgRule
      .oneOf('inline')
      .resourceQuery(/inline/)
      .use('vue-svg-icon-loader')
      .loader('vue-svg-icon-loader')
      .end()
      .end()
      .oneOf('external')
      .use('file-loader')
      .loader('file-loader')
      .options({
        name: 'assets/[name].[hash:8].[ext]'
      })

    // if prod is on
    // assets require on cdn
    if (isProd()) {
      config.plugin('html').tap(args => {
        args[0].cdn = assetsCDN
        return args
      })
    }
  },

  css: {
    loaderOptions: {
      less: {
        modifyVars: {
          // less vars，customize ant design theme

          // 'primary-color': '#F5222D',
          // 'link-color': '#F5222D',
          // 'border-radius-base': '4px'
        },
        javascriptEnabled: true
      }
    }
  },

  devServer: {
    // development server port 8000
    port: 8000
    // TODO api proxy 关于api请求代理: 如果期望启用代理,请删除mockjs的配置 mockjs /src/main.jsL11
    // proxy: {
    //   '/api': {
    //     target: 'https://mock.ihx.me/mock/5baf3052f7da7e07e04a5116/antd-pro',
    //     ws: false,
    //     changeOrigin: true
    //   }
    // }
  },

  // disable source map in production
  productionSourceMap: false,
  lintOnSave: undefined,
  // babel-loader no-ignore node_modules/*
  transpileDependencies: [],
  // 如果项目发布在非根目录,则请到`.env`或`.env.preview`文件中,配置项目名
  publicPath: process.env.PROJECT_NAME ? '' : process.env.PROJECT_NAME + '/'
}

// TODO theme color plugin 关于主题切换插件: 如果想在生产环境启用主题切换功能, 需要使这个表达式为true
// preview.pro.loacg.com only do not use in your production;
if (process.env.NODE_ENV !== 'production' || process.env.VUE_APP_PREVIEW === 'true') {
  // add `ThemeColorReplacer` plugin to webpack plugins
  vueConfig.configureWebpack.plugins.push(createThemeColorReplacerPlugin())
}
if (process.env.NODE_ENV === 'production' && process.env.VUE_APP_PREVIEW !== 'true') {
  // 添加 `UglifyJsPlugin` 插件, 用于打包时,删除console语句
  vueConfig.configureWebpack.plugins.push(new UglifyJsPlugin({
    exclude: /\.min\.js$/, // 过滤掉以".min.js"结尾的文件，我们认为这个后缀本身就是已经压缩好的代码，没必要进行二次压缩
    cache: true,
    sourceMap: false,
    extractComments: false, // 移除注释
    parallel: true, // 开启并行压缩，充分利用cpu
    uglifyOptions: {
      warnings: false,
      compress: {
        drop_console: true,
        drop_debugger: true,
        pure_funcs: ['console.log']
      }
    }
  }))
}

module.exports = vueConfig
